diff --git a/distgit_bugzilla_sync/script.py b/distgit_bugzilla_sync/script.py
index 9d9ded7..aba8dfb 100644
--- a/distgit_bugzilla_sync/script.py
+++ b/distgit_bugzilla_sync/script.py
@@ -331,7 +331,7 @@ class BugzillaProxy:
         for watcher in cclist:
             bz_email = self._get_bugzilla_email(watcher)
             if bz_email:
-                initial_cc_emails.append(bz_email)
+                initial_cc_emails.append(bz_email.lower())
                 initial_cc_fasnames.append(watcher)
             else:
                 self.errors.append(
@@ -346,7 +346,7 @@ class BugzillaProxy:
         # have to do this manually
         owner_email = self._get_bugzilla_email(owner)
         if owner_email not in initial_cc_emails:
-            initial_cc_emails.append(owner_email)
+            initial_cc_emails.append(owner_email.lower())
             initial_cc_fasnames.append(owner)
 
         # Lookup product
@@ -377,20 +377,20 @@ class BugzillaProxy:
             data = {}
 
             # Check for changes to the owner, qacontact, or description
-            if product[pkg_key]['initialowner'] != owner_email:
+            if product[pkg_key]['initialowner'].lower() != owner_email.lower():
                 data['initialowner'] = owner_email
 
             if description and product[pkg_key]['description'] != description:
                 data['description'] = description
 
-            if qacontact and product[pkg_key]['initialqacontact'] != qacontact_email:
+            if qacontact and product[pkg_key]['initialqacontact'].lower() != qacontact_email.lower():
                 data['initialqacontact'] = qacontact_email
 
             if len(product[pkg_key]['initialcclist']) != len(initial_cc_emails):
                 data['initialcclist'] = initial_cc_emails
             else:
                 for cc_member in product[pkg_key]['initialcclist']:
-                    if cc_member not in initial_cc_emails:
+                    if cc_member.lower() not in initial_cc_emails:
                         data['initialcclist'] = initial_cc_emails
                         break